Brightness of the bulb depends on the induced current. The induced current is highest when either end of the magnet is in the middle of the coils.
Consider a situation with changing flux. Starting from the far left of the screen, move the magnet to the right so it goes through the middle of the two loops coil at a constant speed and out to the right of the coil.
Roughly where is the magnet when the light bulb is the brightest? (The brightest of the light bulb correlates with how much the needle of the volunteer gets deflected away from the middle.)
a) The light bulb does not shine since the magnet is moving at a constant speed.
b) The brightest of the light bulb is the same, regardless of the location of the magnet (as long as it is moving).
c) The light bulb is brightest when the middle of the magnet is in the middle of the coil.
d) The light bulb is brightest when either end of the magnet is in the middle of the coil.
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What scientific concept do you need to know in order to solve this problem?
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